... box and needle 小罗经 box barge 箱形驳 box beam 箱形梁 ...
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Box Barge cover 山墙板
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The advanced hoisting technique and control method of prefabricated box girder over sea including spreader gear design, floating crane improvement and transport barge have been expounded in details.
详细阐述了预制箱梁海上新的吊装工艺和控制方法，包括吊具设计、浮吊改造、运输驳改造。
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